Operator Scope of Action:
Operator First Added:
Returns Boolean true if the current note is among the first N children of item. If N is missing, a value of 1 is assumed. The item parameter must be quoted unless an attribute reference. Ways to define item.
Both arguments are evaluated and can be a literal string/number, an attribute value or an action code expression evaluating to that same.
If the current note has a $SiblingOrder value of 2, then if first() is run on its parent container:
first("Note A", 5) returns true
but if 'it has a $SiblingOrder value of 7:
first("Note A", 5) returns false
This replaces the legacy #first query operator. first() also has a logical opposite in last().